Thursday – Sept. 20th

ISN 21 Classification of Matter

Intro to Matter

• Everything around you is composed of matter.

• Besides matter, energy is the other major component of our universe.

Matter

• Matter is anything that occupies space and has mass.

• Some matter is easy to see (water, wood), others are difficult (air, dust).

• The most basic building block of matter is the atom.

Atoms and Molecules

• atoms: submicroscopic particles that are the fundamental building blocks of all matter.

• Sometimes, atoms are bonded together to form molecules.

• molecules: two or more atoms joined to one another in specific geometric arrangements.

Atomic and Molecular Matter

States of Matter

• Matter can be classified by its state.

• solid: closely-packed particles with fixed locations

• liquid: closely-packed particles, but free to move around

• gas: great distances between particles with free movement

II. States of Matter

II. The Solid State

Pure Substances and Mixtures

• Matter can be classified by its composition.

• pure substance: matter composed of only one type of atom or molecule

ex. Helium & H2O

• mixture: matter composed of two or more pure substances that may vary in proportion but maintain their identities

ex: salt water Smog (smoke+ fog)

Mud puddle (dirt + water)

Mixtures • Most matter exists in this form.

• heterogeneous: varied composition from one region to another (different / can be seen) - sand

• homogeneous: uniform composition throughout

• (same / difficult to see particles) – water/air

particles are evenly dispersed

Types of Mixtures:

• Homogenous Mixture:

– particles are evenly dispersed.

– Cannot see particles.

– Solution

• Heterogeneous Mixture:

– Particles are dispersed.

– Can see particles.

– Suspension

– Colloid